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TECHNICAL PAPERS

Gas Jet–Workpiece Interactions in Laser Machining

[+] Author and Article Information
Kai Chen, Y. Lawrence Yao, Vijay Modi

Department of Mechanical Engineering, Columbia University, New York, NY 10027

J. Manuf. Sci. Eng 122(3), 429-438 (Nov 01, 1999) (10 pages) doi:10.1115/1.1285901 History: Received September 01, 1998; Revised November 01, 1999
Copyright © 2000 by ASME
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References

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Chryssolouris,  G., and Choi,  W. C., 1989, “Gas Jet Effects on Laser Cutting,” CO2 Lasers and Applications, SPIE, 1042, pp. 86–96.
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LaRocca,  A. V., , 1994, “Nozzle Design to Control Fluid-Dynamic Effects in Laser Cutting,” SPIE, 2207, pp. 169–180.
O’Neill, W., et al., “The Dynamics Behavior of Gas Jets in Laser Cutting,” Proc. ICALEO’92, pp. 449–458.
Man, H. C., et al., 1997, “Design of Supersonic Nozzle for Laser Cutting With Pressure Gas,” Proc. ICALEO’97, Sec. B, pp. 118–127.
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Oosthuizen, P. H., and Carscallen, W. E., 1997, Compressible Fluid Flow, The McGraw-Hill.
Addy,  A. L., 1981, “Effects of Axisymmetric Sonic Nozzle Geometry on Mach Disk Characteristics,” AIAA J., 19, pp. 121–122.
Ewan,  B. C. R., and Moodie,  K., 1986, “Structure and Velocity Measurements in Underexpanded Jets,” Combust. Sci. Technol., 45, pp. 275–288.
Abbett,  M., 1971, “Mach Disk in Underexpanded Exhaust Plumes,” AIAA J., 9, pp. 512–514.
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Figures

Grahic Jump Location
Comparison of computed and measured streamwise pressure variation along a free jet axis for Mj=2.0 and Pj/Pa=1.45
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Comparison of computed and measured streamwise density variation along an impinging jet axis for Mj=1.0,Pj/Pa=3.0 and H/D=2.5
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(a) Measured through-hole mass flow rate with total gauge pressure for d=0.711 mm. (b) Measured through-hole mass flow rate with total gauge pressure for d=0.508 mm.
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(a) Measured through-hole mass flow rate vs. nozzle standoff distance for d=0.711 mm. (b) Measured through-hole mass flow rate vs. nozzle standoff distance for d=0.508 mm.
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Computed and measured through-hole mass flow rate for d=0.711 mm
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Computed and measured through-hole mass flow rate for d=0.711 mm
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Schematic of underexanded (a) free jet and (b) impinging jet
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Schematic of computational domain for simulations
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Schematic of experimental setup
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(a) Contour of static pressure for Pe=207 kPa (d=0.711 mm, H=2 mm). (b) Contour of static pressure for Pe=276 kPa (d=0.711 mm, H=2 mm).
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Computed variation of total pressure along the centerline for H=2.0 mm and d=0.711 mm
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(a) Contour of static pressure for H=2 mm (d=0.711 mm, Pe=363 KPa). (b) Contour of static pressure for H=3.25 mm (d=0.711 mm, Pe=363 KPa).
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Static pressure gradient inside hole
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Shear force inside hole
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Profilometer measurements of cut surface with different gas pressure at 2.0 mm standoff (incomplete cuts at Pe=323 kPa,Pe=363 kPa)
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Dross attachment on cut surface with different standoff (incomplete cuts for H=2.0 and 2.5 mm)

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